Subterror Behemoth - Hard Control / Stun

My most solid deck I built with help of AI and tested it with hand draws and meta bot games. Runs really well.

Lord of The Heavenly Prison apparently is Grade A in my Deck. You can use it at the start of each of your turns and your Face-down cards are indestructible for as much as you want. Or you can trade that destruction immunity for a 3000 ATK / 3000 DEF beater.

I wanted more disruption so I started using Super Polymerization. I've read in meta games it's Grade A. I have 10 targets.

Note: I swapped Super Polymerization for Ultimate Slayer and Gordian Slicer as Super Polymerization doesn't always work. Those 2 cards are better suited for boards that can OTK as they just bounce but it will give you some breathing room and a bonus effect. You can swap for Super Poly if you'd like.

Pro Tip: Your Subterror effects can work under Skill Drain. You will need a spare Subterror Final Battle and use it's 4th effect to accomplish that but it's well worth it, working as a one-sided floodgate. Unless they can remove it fast GG.

Pro Tip: If you have Subterror Guru face-down and he gets attacked but you don't have Hidden City you can help him with Final Battle. Press Chain On before the attack and wait for Guru to flip up which is the Battle Step "Before Damage Calculation" then you can buff his defense with Final Battle because he will be face-up. Lord of The Heavenly Prison protects Final Battle so it won't be so easy for opponent to get rid of it.

Tip: Guru needs to have another Subterror card on the field with him to use his flip facedown effect as Spell Speed 2. The usual option is Subterror Cave Clash. You can also activate Subterror Final Battle and then Guru's effect will become Spell Speed 2 and you'll be able to chain it in order to disrupt enemy's monster.

Tip: Flip Enemy Monsters facedown with Ultramafus then pop them with Stygokraken. They can't protect themselves with Anti-Destruction or Anti-Targeting effects when they are Face-down. They also aren't immune to Ultramafus Flip-down as it's neither targeting nor destruction.

Tip: Pop Enemy backrow with Stygokraken. Use Final Battle beforehand so they don't negate it